Cash-register.



Patented July 1, I902 A. GERDES.

CASH REGISTER.

(Application filed Oct. 22, 1901.)

(No Model.

me NORRIS FEYERs co, PHOTO-LITHO.. WASHINGTON, v.1:v

UNITED STATES PATENT OFFICE.

ADOLF GERDES, OF BERLIN, GERMANY.

CASH-REGISTER.

SPECIFICATION forming part of Letters Patent No. 703,570, dated July 1,1902.

Application filed October 22,1901. Serial No. 79,578. (No model.)

To all whom it may omwcrn:

Be it known that I, ADOLF GERDEs, a subject of the Emperor of Germany,residing at 12 Wilhelmstrasse, Berlin, German Empire, have invented anew and useful Arrangement on Cash-Registers, of which the following isa specification.

The present invention relates to cash-registers which are actuated bythe depressing of keys; and it consists of the novel construction of theaddition-works in such a way that each pair of adjacent-lyingcounting-wheels receive an oppositely-directed force, so that saidwheels rotate in opposite directions. By this means, therefore, theresult is obtained that should two adjacent keys be simultaneouslydepressed only one of the adjacent countingwheels would be rotated-116., the tenswheelwhile the units-wheel wouldonly be rotated when itsaxle is turned to the zero position through the action of its backspring. Itis thus obvious that this arrangement eliminates all falseaddition of the counting-gear and makes the latter most certain.

In the accompanying drawings, in which similar letters of referencerefer throughout to similar parts, Figure 1 illustrates a longitudinalsection of the addition-works of a cash-register embodying the presentinvention. Fig. 2 shows, on an enlarged scale in front elevation, thecounting (addition) gear. Fig. 3 pictures a key in a lower or depressedposition in cross-section on line A B of Fig. 1. Fig. 4 is a plan viewof the device shown in Fig. 2.

In the construction of the inventiona shaft 1 is employed, and which ismounted in suitable bearings in a box or casing. mounted on this shaftare two arms 8 and 4:, which lie adjacent to the inner walls of saidcasing. A cross-rod 5 is mounted between these two arms and parallel tosaid shaft and rotatable with the latter. The are described by said rodis limited on the one hand by the floor 6 of said casing and on theother by stops 5 5, fastened to said walls. As is obvious, one of theseshaftsis arranged for each row of keys, the latter being mounted in aline above and parallel to said shaft. Each key comprises a plunger 8,sliding up and down in suitable guide holes formed in the top 9 of saidcasing and said floor 6. Mounted ed-on the tens-shaft 20. Rigidly oneach plunger is an arm 10, provided with a rod 11, which latter, slidingup and down also through said floor, acts as a guide and serves tostiffen arm 10. From Fig. 3 this construction will be clearlyunderstood. As the key is pressed downwardly arm 10 strikes saidcross-rod 5, driving the latter in an are down and about said shaft, andas rod 5 is fast by means of arms and to said shaft the latter is thusrotated a predetermined distance. A collar 1 on said plunger limits theupward movement of the latter, which occurs when pressure is removedfrom the key and by means of a spiral spring 12 coiled about saidplunger and pressing at one end on said floor and with the other againstsaid collar. A spring 7 serves to return said shaft and cross-rod totheir position. As will be seen from Fig. 1, the arms 10 are graduatedin their positions on the said plunger, so as to give a differentialmovement to bar 5 when depressed. The opposite motion of the adjacentcounting-wheelsfor example, the unitswheel 2 and the tens-wheel1isobtained in the following manner: The units-Wheel 2 is loosely mountedon shaft 1 and carries a spring-actuated pawl 16, (see Fig. 2,) engaginga ratchet 15, rigidly mounted on shaft 1. As said shaft is rotated bysaid shaft pawl 16 rides over said ratchet; but as the latter isreversed by spring 7 it catches the pawl, and thus rotates theunits-wheel, while the tens-wheel, mounted on a hollow axle 17, isalready rotated during the down motion of the key-plunger by means of apawl 18, carried by its ratchet 19, which is rigidly mount- (See Fig.2.)

The motion of the units-wheel is transferred to the tens-wheel'in themanner that by pressing down one of the keys in the units-row theratchet 15 is turned, and by the upward spring of the key the saidratchet engages the pawl 16, thereby turning the units-wheel. For everyten teeth of the units-wheel one tooth of the ratchet 21, mountedtherewith and shown in dotted lines, Fig. 2, engages a pawl 23, which asthe last of the ten teeth passes under the action of spring 22 engagesthe tens-wheel by means of a spring-actuated pawl 24, thus moving thesaid tens-wheel one number forward, as may be'seen from Fig. 1. Thetens-wheel and hundreds-wheel are similarly connected,&c. lhe pawl25,m0unted on shaft 1 and having aspring 26, engages the tens-Wheel 14Lfor preventing back turnmg.

5 Having now described my invention, what I claim as new, and desire toprotect by Letters Patent, is-

In a cash-register the combination of a shaft,

a cross-rod parallel thereto and connected [0 therewith and adapted topartially rotate thereabout,key-plnngers, arms on said plungers adaptedto engage said rod and rotate said shaft by pressing down saidkey-plungers, a spring on each of said plungers, a

\ i5 ratchet rigidly mounted on said shaft, a units-

